The objectives of this study are to assess molecular testing, treatment patterns, and associated outcomes among patients with EGFR (Epidermal Growth Factor Receptor) mutation-positive locally advanced or advanced NSCLC (Non-Small Cell Lung Cancer) who have progressed on or after EGFR-TKI (EGFR-Tyrosine Kinase Inhibitor) therapy post availability of a third-generation TKI (primary study cohort). Additionally, molecular testing and treatment patterns will be assessed among a secondary cohort of patients which will include patients diagnosed with de-novo EGFR T790M mutation-positive locally advanced or advanced NSCLC.

Inclusion Criteria - Primary Study Cohort

• Provision of written informed consent (patient consent should be within 6 weeks of disease progression, defined elsewhere as the Index Date)
• Adult male or female subjects (according to age of majority/adulthood as defined by local regulations)
• Patients with prior confirmed EGFR mutation-positive (all mutations) locally advanced or advanced NSCLC - Patients who developed resistance to an EGFR-TKI due to any other phenotypic/histologic transformations (e.g., small-cell lung cancer, EMT) or other mutations (e.g., HER2, MET amplifications) at the index-date will be eligible for participation in this study as long as they have prior confirmed diagnosis of EGFR mutation-positive (all mutations) locally advanced or advanced NSCLC
• Patients who have progressed on or after EGFR-TKI therapy (i.e., gefitinib, erlotinib or afatinib) within the patient selection period

Inclusion Criteria - Secondary Study Cohort

• Provision of written informed consent (patient consent should be within 6 weeks of NSCLC diagnosis, defined elsewhere as the Index Date)
• Adult male or female subjects (according to age of majority/adulthood as defined by local regulations)
• Patients diagnosed with de-novo EGFR T790M mutation-positive locally advanced or advanced NSCLC during the patient selection period. The de-novo T790M mutation can be alone or in combination with other mutations (e.g., L858R and T790M).

Exclusion Criteria - Primary and Secondary Study Cohorts

• Enrollment in studies that prohibit any participation in this non-interventional study. These patients will be censored.

800 patients across both cohorts - 700 patients primary cohort and 100 patients secondary cohort. Patients will be recruited from approximately 100 participating sites in Germany (70 hospitals and 30 outpatient practices).

Qualified researchers can request access to anonymized individual patient-level data from AstraZeneca group of companies sponsored clinical trials via the request portal. All request will be evaluated as per the AZ disclosure commitment: https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure Yes, indicates that AZ are accepting requests for IPD, but this does not mean all requests will be shared.

AstraZeneca will meet or exceed data availability as per the commitments made to the EFPIA Pharma Data Sharing Principles. For details of our timelines, please rerefer to our disclosure commitment at https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure.

When a request has been approved AstraZeneca will provide access to the deidentified individual patient-level data in an approved sponsored tool . Signed Data Sharing Agreement (non-negotiable contract for data accessors) must be in place before accessing requested information. Additionally, all users will need to accept the terms and conditions of the SAS MSE to gain access. For additional details, please review the Disclosure Statements at https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure.